- Industria: Aviation
- Number of terms: 16387
- Number of blossaries: 0
- Company Profile:
Aviation Supplies & Academics, Inc. (ASA) develops and markets aviation supplies, software, and books for pilots, flight instructors, flight engineers, airline professionals, air traffic controllers, flight attendants, aviation technicians and enthusiasts. Established in 1947, ASA also provides ...
A space in which nothing exists, a completely empty space. For practical purposes, a vacuum is considered to be a negative pressure, or a pressure less than that of the surrounding atmosphere.
Industry:Aviation
A space vehicle designed to land on a celestial body, such as the moon or one of the planets.
Industry:Aviation
A spar, or small-diameter structure that connects the tail section of an aircraft to a pod-type fuselage.
Industry:Aviation
A spark plug entirely enclosed in a steel housing. A shielded ignition lead terminates with an insulated connector that fits into an insulated cavity inside the spark plug. The nut on the end of the ignition lead screws onto the spark plug barrel.
Electromagnetic energy released when the spark jumps the gap in the spark plug is picked up by the metal in the spark plug and the shielded ignition lead, and is carried to ground preventing it from causing radio interference.
Industry:Aviation
A spark plug failure that occurs when a reciprocating engine is started in extremely cold weather. When a cylinder fires, the fuel-air mixture is converted into carbon dioxide and water vapor. The water vapor condenses on the spark plug electrodes and forms ice that bridges the electrode gap and prevents the plug firing until the ice is melted. This normally requires removing the spark plugs from the engine.
Industry:Aviation
A spark plug that is unable to fire because of contamination in its firing-end cavity. Oil, soot, silicon deposits, or lead deposits can build up in the firing end until they provide a bridge that allows the voltage to leak off before it can build up high enough to jump across the gap between the electrodes.
Industry:Aviation
A spark plug with a long path for heat to travel from the nose core insulator to the spark plug shell. Because the heat must travel a long distance before it is transferred into the cylinder head, the nose core stays quite hot.
Hot spark plugs are used in low-powered engines because a cold spark plug would not get hot enough to burn the contaminants out of its firing-end cavity. If these contaminants are not burned out, they will foul the spark plug and prevent it from firing properly.
Industry:Aviation
A spark plug with a short path for the heat to travel between the nose core insulator and the shell. A cold spark plug carries the heat away from the nose core, so it can operate in a high-compression engine without the nose core becoming too hot. Too hot a nose core can cause preignition in the cylinder.
Industry:Aviation
A special abrasive compound, used inside an aluminum terminal that is being swaged onto an aluminum electrical wire. As the terminal is compressed, the zinc dust abrades the oxide from the wires, and the petrolatum prevents oxygen reaching the wire, so no more oxides can form.
Industry:Aviation
